var imgMouseOver = (((navigator.appName == "Netscape") && (parseInt(navigator.appVersion) >= 3 )) || ((navigator.appName == "Microsoft Internet Explorer") && (parseInt(navigator.appVersion) >= 4 )));

var ph_chickenpox = new Image();
ph_chickenpox.src = "/images/ph/ph_chickenpox.gif";
var ph_chickenpox_over = new Image();
ph_chickenpox_over.src = "/images/ph/ph_chickenpox_over.gif";
var ph_dtap = new Image();
ph_dtap.src = "/images/ph/ph_dtap.gif";
var ph_dtap_over = new Image();
ph_dtap_over.src = "/images/ph/ph_dtap_over.gif";
var ph_hepatitis_a = new Image();
ph_hepatitis_a.src = "/images/ph/ph_hepatitis_a.gif";
var ph_hepatitis_a_over = new Image();
ph_hepatitis_a_over.src = "/images/ph/ph_hepatitis_a_over.gif";
var ph_hepatitis_b = new Image();
ph_hepatitis_b.src = "/images/ph/ph_hepatitis_b.gif";
var ph_hepatitis_b_over = new Image();
ph_hepatitis_b_over.src = "/images/ph/ph_hepatitis_b_over.gif";
var ph_hib = new Image();
ph_hib.src = "/images/ph/ph_hib.gif";
var ph_hib_over = new Image();
ph_hib_over.src = "/images/ph/ph_hib_over.gif";
var ph_lyme = new Image();
ph_lyme.src = "/images/ph/ph_lyme.gif";
var ph_lyme_over = new Image();
ph_lyme_over.src = "/images/ph/ph_lyme_over.gif";
var ph_meningococcal = new Image();
ph_meningococcal.src = "/images/ph/ph_meningococcal.gif";
var ph_meningococcal_over = new Image();
ph_meningococcal_over.src = "/images/ph/ph_meningococcal_over.gif";
var ph_polio = new Image();
ph_polio.src = "/images/ph/ph_polio.gif";
var ph_polio_over = new Image();
ph_polio_over.src = "/images/ph/ph_polio_over.gif";

function over(img_name) {
    document[img_name].src = "/images/ph/"+img_name+"_over.gif";
}

function out(img_name) {
    document[img_name].src = "/images/ph/"+img_name+".gif";
}